Sponge for substrate cleaning



FIG. 1 is a perspective view observed from a top of a sponge for substrate cleaning showing our new design;

FIG. 2 is a perspective view observed from a bottom thereof;

FIG. 3 is a front view thereof, a rear view being identical thereto;

FIG. 4 is a left side view thereof, a right side view being identical thereto;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a cross-sectional view thereof taken along section line 7-7 of FIG. 5.

The broken lines in the figures represent portions of the sponge for substrate cleaning that form no part of the claimed design. 

CLAIM The ornamental design for a sponge for substrate cleaning, as shown and described. 